According to Bluemix support:
I'm sorry to hear that you are having trouble creating an environment variable. I see that you are currently using the asterisk in your variable value. This is what is causing the issue. We are currently aware of certain symbols that will not work in the environment variable value field and are working to resolve this issue. As a temporary work around, you can issue the following command via the CF-CLI from your terminal that will allow you to create the variable name with the asterisk.
cf set-env appname env_var_name env_var_value
I can confirm the workaround suggested worked.
According to Bluemix support:
I'm sorry to hear that you are having trouble creating an environment variable. I see that you are currently using the asterisk in your variable value. This is what is causing the issue. We are currently aware of certain symbols that will not work in the environment variable value field and are working to resolve this issue. As a temporary work around, you can issue the following command via the CF-CLI from your terminal that will allow you to create the variable name with the asterisk.
cf set-env appname env_var_name env_var_value
I can confirm the workaround suggested worked.